Substation telephone set.



A. E. LUNDEL'L. suBsTAT-ioN T EL-EBHQNE SET. APPLICATION FILED IAN. 3. |916.`

Patented J u ly 10, 1917.

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, INCORPORATED, OE

NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

SUBSTATION TELEHONE SET.

To all 'whom t may concer/n:

Be it known that I, ALBEN E. LUNDELL, a citizen of theUnited States, residing at .New York, in the county of Bronx and State of New York, have linvented certain new and useful Improvements in Substation r1`elephone Sets, of which the following is a full, clear, concise, and exact description.

This invention relates to substation telephone sets, and more particularly to substation sets for automatic telephone exchanges. In substation sets for automatic telephone provide, in addition to the contact springs through which the talking and ringing circuits are controlled, e. g. the switchhook springs, a set of contact springs by means of which impulses may be sent out from the substation' for controlling the operation of automatic switches. This has been necessary in order to control the operation of Isuch selector switches by means of a special impulse-sending mechanism 'rather than bythe switchhook.

It is the object of this invention to provide a substation telephone set in which the I impulse-sending mechanism controls the i switchhook contacts for sending1 out impulses toward the selector switches. A

While the invention is described as applied to a telephone desk stand, it will be obvious that this invention may be embodied in telephone sets of widely varying charac t'er. It will be further obvious that instead of thev disclosed rotary nger hold calling device, impulse-sending mechanisms of various types may be employed, without departing from the spirit of this invention.

`In the drawings, Figure 1 is a side elevation, partly in section, of a telephone set embodying this invention. There is shown in this figure a diagram of a circuit adapted to be operated under the control of the substation set. Fig. 2 is a perspective view of the 45 contact springs and the mechanism for actuating the same. Upon the removal of a receiver 10 from a switchhook 11, pivoted at 9 to a support 8 within a hollow standard 26, arm 12 of contact spring 13, by engaging a stud 14 of the switchhook, will force the same' in an upward direction, whereupon the normally separated contact springs 13, 15 and 16 will make contact. The contact springs are mounted on but are insulated from support 8. line circuit is established from grounded battery, through the right-hand winding of a relay 17, conductor 18, transmitter 19, conductor 20, contact springs 13 and 15,

conductor 21, the primary winding of an induction coil 22, and the left-hand winding of relay 1'? to ground. Relay 17 becomes energized. Receiver 10 is .inductively connected with the transmitter circuit through the secondary winding of induction coil 22,

conductors 2.3 and 24, spring 16, and the condenser. y

The subscriber may now proceed to operate relay 17 in accordance with the numerical designation of the called line, by actuating an impulse-sending device 25 fastened in any desirable manner to standard 26 of the desk stand. He will insert his finger in a hold, vsuch as 27, through which the numeral representing the desired digit appears,l said numeral being indicated cna plate 28 located' behind plate 29, on which the finger holds are provided. Dial 29 is fastened to a rotatable shaft 30, and plate 28 to frame 11 of the calling device. Fastened to shaft 30behind plate 28, are. an impulse wheel 31 anda gear wheel 32. The subscriber rotates plate 29 and therefore shaft 30 and wheels 31 and 32 in a clockwise direction until his finger reaches a stop '33. The teeth 34 of wheel 31 engage an arm 35 of a pawl 36 pivoted at 37, to support 8 and projecting through an opening of standard 26, and cause thus an insulated stud 39 car-l ried by arm 38 to move away from arm 40 of contact spring 13 without disturbing the contact between springs 13 and 15. Gear wheel 32 drives, by means of a gearing arrangement 50, a governor 51. This governor, however, does not control the speed of rotation ofthe devices during the clockwise movement thereof. During the forward movement of-dial 29, a motor spring 52, one end of which is fastened to shaft 30 and the other end to plate 28, is woundv up, and when the user releases the dial 29, motor spring 52 carries the shaft 30 and the members 29, 31 and 32 fastened thereto, back to normal. The teeth 34 of wheel 31 press arm 35 of pawl 36 downwardly, whereby stud 39 of arm 28 of this pawl will be moved against arm LOof spring 13 forcing this arm away from contact sprlng 15. The circuit of relay 17 will thusbe broken, and the desired number of impulses transmitted,

there being provided one tooth 24 for each finger hold 2 During the backward movement of shaft 30, its speed of rotation is conf springs 1,3 and 1'5 make contact, and therelore, the subscriber will clicks in his receiver.

What is claimed is:

1. In a telephone set, a transmitter and a receiver, three contact springs for controlling the circuits of said receiver and transmitter, and an impulse-sending mechanism for variably operating said contact springs.

2. Avtelephone set comprising a transmitter circuit, a receiver circuit inductively conget no objectionable nected therewith, a, Contact in each of said circuits, a switchhook for controlllng sa1d contacts, and an impulse-sending mechanism for successively actuating s aid contacts.

3. A telephone set comprising a transmitter circuit, a receiver circuit lnductively connected therewith, a contact in each of -said circuits, a swtchhook for controllingv In witness whereof, I hereunto subscribe my name this 31st day of December, A. D. 1915. f

ALBEN E. LUNDELL.

(iopiesl of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

